species. It was also applicable as a chemoselective hydrogenation catalyst, showing inactivity for the hydrogenolysis of tert‐butyldimethylsilyl (TBS) ethers, alkyl benzyl ethers, and benzyl alcohols. The tert‐amines on WA30 acted as moderate catalyst poisons for Pd, resulting in chemoselective hydrogenation. 7% Pd/WA30 was reused for at least five times without any loss of the hydrogenation catalytic
developed a highly chemoselective hydrogenation method using a novel palladium catalyst supported on spherical carbon (0.5 % Pd/SC). The 0.5 % Pd/SC exhibited a novel catalytic activity and could achieve the chemoselective hydrogenation of alkynes, alkenes, azides, nitro groups, and aliphatic O‐tert‐butyldimethylsilyl (TBS) ethers without hydrogenolysis of benzyl esters, benzyl ethers, nitriles, aromatic
Pd/C[Ph2S], was developed to achieve the highly chemoselectivehydrogenation of alkenes, acetylenes, azides, and nitrogroups in the presence of aromatic ketones, halides, benzyl esters, and N-Cbz protective groups. Instrumental analyses of the heterogeneous catalyst demonstrated that diphenyl sulfide was embedded on Pd/C via coordination of its sulfur atom to palladium metal or physical interaction with graphite
开发了一种固定在钯碳体系上的二苯硫醚Pd / C [Ph 2 S],以在芳族酮,卤化物,苄基酯存在下实现烯烃,乙炔,叠氮化物和硝基的高化学选择性氢化。和N-Cbz保护基。对非均相催化剂的仪器分析表明,二苯硫醚通过其硫原子与钯金属的配位或与活性炭石墨层的物理相互作用而嵌入Pd / C中。催化剂可被回收并重复使用至少五次,而反应活性没有任何显着损失。
Easily-Controlled Chemoselective Hydrogenation by using Palladium on Boron Nitride
hydrogenation catalyzed heterogeneously by palladium on boronnitride (Pd/BN) in methanol realized the chemoselective hydrogenation of only azides, alkenes, and alkynes in the presence of other reducible functionalities such as benzyl ethers, aryl halides, aryl ketones, and nitro groups. Furthermore, the totally chemoselective semihydrogenation of alkynes could also be achieved without the reduction
specific chemoselectivity for hydrogenation that has never been achieved by other palladium‐catalyzed methods. Either aliphatic or aromatic N‐Cbz groups could be deprotected to the corresponding free‐amines, while the hydrogenolysis of benzyl esters and ethers did not proceed. Furthermore, aryl chlorides and epoxides were tolerant under the Pd/ceramic‐catalyzed hydrogenation conditions. 5 % Pd/ceramic